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Synchronized switching in a josephson junction crystal.

Martin Leib1, Michael J Hartmann2

  • 1Technische Universität München, Physik Department, James Franck Straße, 85748 Garching, Germany.

Physical Review Letters
|June 21, 2014
PubMed
Summary
This summary is machine-generated.

We demonstrate a superconducting resonator with Josephson junctions exhibiting single-photon optical nonlinearity. A red-detuned drive induces a sharp, synchronized quantum-to-classical switching in normal modes.

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Area of Science:

  • Quantum optics
  • Superconducting circuits
  • Nonlinear systems

Background:

  • Superconducting circuits offer a platform for quantum information processing.
  • Josephson junctions introduce strong quantum nonlinearity.
  • Coplanar waveguide resonators confine electromagnetic fields.

Purpose of the Study:

  • To investigate the nonlinear optical properties of a Josephson junction-coupled resonator.
  • To explore the behavior of normal modes in a nonlinear extended medium.
  • To observe quantum-classical phase transitions driven by external fields.

Main Methods:

  • Fabrication of a superconducting coplanar waveguide resonator with integrated Josephson junctions.
  • Characterization of normal mode behavior and nonlinearity at the single-photon level.
  • Application of a red-detuned optical drive to probe nonlinear responses.

Main Results:

  • The device exhibits optical nonlinearity tunable by Josephson junction plasma frequencies.
  • Normal modes cluster and degenerate, leading to enhanced nonlinear effects.
  • A sharp, synchronized switching from low-occupation quantum states to high-occupation classical fields was observed.

Conclusions:

  • The Josephson junction resonator acts as an optically nonlinear medium accessible via ports.
  • Degenerate normal modes facilitate a pronounced quantum-to-classical transition.
  • This system provides a controllable platform for studying nonlinear quantum phenomena.